/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 头部样式 */
header {
    background-color: var(--surface);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 0.5rem;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-btn:hover {
    background-color: var(--background);
    color: var(--primary-color);
}

.nav-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.user-info {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 主内容区域 */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.view {
    display: block;
}

.view.hidden {
    display: none;
}

/* 按钮样式 */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    font-size: 0.875rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #475569;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* 输入框样式 */
.filter-input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* 筛选器样式 */
.filters {
    background-color: var(--surface);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.filters h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: flex-end;
}

.filter-group label {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.filter-group label span {
    font-weight: normal;
    color: var(--text-secondary);
}

/* 活动列表样式 */
.events-list {
    background-color: var(--surface);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
}

.events-list h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.event-card {
    background-color: var(--background);
    padding: 1.25rem;
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.event-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.event-card:last-child {
    margin-bottom: 0;
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.event-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
}

.event-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 1rem;
    font-size: 0.75rem;
}

.event-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.event-info span {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.event-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.event-price {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--success-color);
}

.event-availability {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.availability-bar {
    width: 100px;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.availability-fill {
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.3s;
}

.availability-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 页脚样式 */
footer {
    background-color: var(--surface);
    padding: 1rem 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    box-shadow: var(--shadow);
}

/* 响应式设计 */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: stretch;
    }

    nav {
        justify-content: center;
    }

    .user-info {
        justify-content: center;
    }

    main {
        padding: 1rem;
    }

    .filter-group {
        flex-direction: column;
        align-items: stretch;
    }

    .event-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .event-info {
        flex-direction: column;
        gap: 0.5rem;
    }

    .event-footer {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .event-availability {
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.25rem;
    }

    .nav-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.8125rem;
    }

    .btn {
        width: 100%;
    }
}